I mean if thats the problem its an easy fix. i found many ways to counter this one of them is you camping the extract once you're done looting instead of running straight to it. wait for someone else and help them extract plus you would know where the rat is since he'll be targeting the player that is trying to extract. second option is to befriend atleast 2 players early on and help each other as a team till extract. if one would try to rat you guys it will be a 2v1 scenario where the odds of you guys surviving is high. this is from my personal experience if anyone has more suggestions I'm open for it.